Watch the Add a Travis Picking Pattern online guitar lesson by Vicki Genfan from Acoustic Rhythm Guitar Cookbook
Focus first on the picking pattern. Spend some time getting your fingers used to the pattern using the open D chord (yay, no left hand fingerings!). You may already know it, but if it's new to you, the Travis picking pattern is extremely versatile and is used in many styles and genres of music. When learning the chords, remember to keep any fingers down that you can as you change chords.